"He had a thorough knowledge of the nature of sound waves": 145 years ago, Alexander Bell patented the telephone
2021-03-07T07:16:50.340Z
On March 7, 1876, mankind got a telephone - the scientist and teacher Alexander Bell received a patent for the telephone set he created. Bell's invention quickly gained international popularity. At the beginning of the twentieth century, there were more than 10 thousand telephone exchanges in the world, which served about 10 million subscribers.
Source: russiart